A team of scientists from the University of Cincinnati discovered fossils in two separate locations that appear to be somewhere between 2.5 and 3.5 billion years old, from the Archean Eon.

Those fossils—the squiggly, microscopic remains of organisms that subsisted on methane—broaden the scope of what habitats were suitable for life on Earth during the Archean Eon. Life ...

[7 Wild Theories on the Origin of Life] But until now, most of what researchers knew about this eon, called the Archean, has been based on a handful of fossils from shallow-water environments.

Earth's oldest fossils The scientists collected 130 pounds ... who did not take part in this research. Buick studies the Archean eon, which lasted from 3.8 billion to 2.5 billion years ago ...

Scientists have found the oldest physical evidence for life on earth in the fossils of Greenland rocks that are 3.7 billion years old. The newly discovered fossils are 220 million years older than ...

Closer to the present, other rainstorms eroded the overlying tuff, exposing a fossil record of raindrops from the Archean eon, and may now have revealed the density of early Earth's atmosphere.